What happen when monochromatic light irradiated on reflective grating

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what happen when monochromatic light irradiated on reflective grating? where is the light will be? what is the pattern like? thank you very much!
best wishes!
 

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Claude Bile said:
Hint: Use Bragg's Law.

Claude.

still no idea! I am stupid!
 
I am loathe to simply give you the answer, when there are ample sources online to figure it out for yourself.

It would do you no favors; you are better off learning how to answer basic questions such as this on your own.

If you are stuck, show us exactly where, and why and we will be more obliged to help!

Claude.
 

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